Torsion Spring +Pin Joint
Altair EmployeeHallo Guys,
i want to define a Pin-Joint with Torsion Spring (See the foto)
at first: two bar are connected with pin joint.
second: later add a Torsion Spring to this pin joint.
Programming in Hw:
for Pin Joint
Bar A: pins a : 0 , pins b: 456
Bar B: pins a : 0 , pins b: 0
for torsion spring
SPC: Dof4 : 400000 (NM)
But this simulation runs wrong!!
how can i define right pin joint with torsion spring for two bars????
Best Regards!
Leslie
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
Answers
-
Hi there,
Could you show a screenshoot with global system and local systems?
what kind of wrong simulation? it is error or result is wrong?
If your case is planar then only pin dof 6 (assume screen normal is z axis)
for torsion spring you can use elas1 with C#6
anyway i tested it successfully running:
/emoticons/default_wink.png' alt=';)' srcset='/emoticons/wink@2x.png 2x' width='20' height='20'>
SUBCASE 1LABEL testANALYSIS STATICSSPC = 1LOAD = 2BEGIN BULKGRID 1 0.0 0.0 0.0GRID 2 500.0 500.0 0.0GRID 3 0.0 500.0 0.0CELAS1 3 2 3 6CBEAM 1 1 1 31.0 0.0 0.0+ 6CBEAM 2 1 3 20.0 -1.0 0.0PBEAML 1 1 ROD ++ 50.0 0.0PELAS 24.0+8 0.0 0.0MAT1 1210000.0 0.3 7.9-9SPC 1 1 1234560.0FORCE 2 2 01.0 0.0 -15000.00.0ENDDATA
0 -
thanks for your help!
Can u tell me, how do u define the pin Joint between 2 bars, donot use pins a/b???
how do u define the Torstion Spring between 2 bars, use elas1 ???
i use HW-Panel, not code!
0 -
at first: two bar are connect with pin joint.
second: later add a Torsion Spring to this pin joint !!
i hope, u understanding what i mean!
0 -
Altair Forum User said:
at first: two bar are connect with pin joint.
second: later add a Torsion Spring to this pin joint !!
i hope, u understanding what i mean!
Yes I use hm panel, and the codes i send you is exported deck
1) create 3 nodes: 1- (0,0,0) , 2-(0,500,0), 3-(500,500,0)
2) create bar1: nodeA - 1, pin 0
nodeB - 2, pin 6
3) create bar2: nodeA- 2, pin 0
nodeB -3, pin 0
4) make material, PBEAML assign section size
5) make a PELAS, assign K
6) make a CELAS1 (use panel 1D>masses, switch elems type to CELAS1), pick node 2, property PELAS
7) edit card the CELAS1 elems, set C=6
8) assign load, spc, loadstep and run
Have a good job!
0 -
And if you let pin 456 then you should set C=456. but in your case there is no moment around y nor x, so need #6 only
Do you understand CELAS1 card? - read reference help optistruct first
0 -
Thanks for your help, but i donot know, how to do step 7 in hw (edit card the CELAS1 )?
7) edit card the CELAS1 elems, set C=6
0 -
Hi Leslie
did you see 'card edit' button on the toolbar? There it is
<?xml version="1.0" encoding="UTF-8"?>
0 -
tinh thanks very much,
if i want to define 3 Torsion Spring (x,y,z) for the same Node, i donot think, this way is useful
0 -
Altair Forum User said:
tinh thanks very much,
if i want to define 3 Torsion Spring (x,y,z) for the same Node, i donot think, this way is useful
Sorry Leslie,
I tell you that using mass panel to create celas1 but this is ground spring, so it may not suitable with your case
could you try again with this way:
- make 2 cbeams but not connect together
- make a celas1 by spring panel that connect 2 ends of 2 cbeams
- f3> uncheck 'equivalence' then stick 2 nodes of spring together
and also i miss that cannot set 3 dofs for this springperhaps, you can make 3 celas0 -
ah, you can use cbush for 3-dof spring because PBUSH has 6 stiffness
never need to make 3 celas
'>0
